Probability - PowerPoint PPT Presentation

Probability Properties of probabilities 0 ≤ p(A) ≤ 1 0 = never happens 1 = always happens A priori definition p(A) = number of events classifiable as A total number of classifiable events A posteriori definition p(A) = number of times A occurred total number of occurrences So:

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A conditional probability is one where you are looking for the probability of some event with some sort of information in hand, e.g. the odds of having a boy given that you had a girl already.

A joint event or probability would be the probability of a combination of events e.g. that you have a boy and a girl for children

Aside: In this case the conditional would be higher b/c if we knew there was already a girl that means they’re of child-rearing age, probably interested in having kids etc. We have some additional info that would help us if we were just drawing out people randomly from some population.